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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8f3639dfec76582d49eba7e3e04786a8d16cb5765aefbe23520408b0126bc96' 
  AND token = 'WSIAhJp5omMUz3ZP2As+iVfcWFVzS3VSmytaK/J1Sho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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