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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '249d266f4120c289afebe987fc88d1e31d6a677eb0ea6009f5e8f23f41a76dd0' 
  AND token = 'vCYH7mt2cTDqQdl8ODFycO1XjguJeRWHPJBxtbzkbM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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