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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5dc233f3b105fadbf0773628cfec47fd0cf2a5236d0e10d39ce8fd1c903b0bb3' 
  AND token = '9eW5gYtACRNCdYuzubInYNFzuljnsJXultPrtD18kD0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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