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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0d8c014a3bef6444327af9b953daa5dfd1465b39e428368862c65be40c5e634' 
  AND token = 'q0YKQ2JdT8PGGJ0xQw6O4TkULYyJoa6plaa07aD5f6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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