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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23b11b8f32e1d36f9e2ca8a7e5b42eccdc9d8c604f8d6d478782b64b6577a2c9' 
  AND token = 'lF8Z9i+vs8r8Xpdz1j9iF2RkeRHNqD4+FgPD2j7fuhE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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