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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '800c275f79279dbcae380d09302112b2ed73683bb72577a9a9e3adc2ad8b6fd4' 
  AND token = 'LnXz77CMlDfkM0BXDy0b4cz959EwW34wpVWj4A13evc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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