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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '431daf0e78d422538477ce3ff8d487cfb3fc544be0cb09b681b4476fc92b9aaf' 
  AND token = 'DsRtIniJavbAW+UXiXOcZK8NiFYdCivuWYvlLR/4OwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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