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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0508ca09fbc85e382eb9be6afcf846034f348276b22d226f33a09cb0bbfdef4b' 
  AND token = '0RjvTs97WpXWzNVkTbu8eDuk2gUVfrvtttiMoIANE2A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}