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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2c7a81170b44df47d681780e34f83d7b0a03e7204b0256c2caaad4a6502afca' 
  AND token = 'LZOf98KzRBbR6mvA0izyOE3QrJiuQhCHjHYNCnSn1gI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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