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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be934924d19ed746b0bdc3bc3d0526c4d0586d68f7d67c428abf0261ab5cd12f' 
  AND token = 'uDs5K17U+N+felTGSAHcnbk7Sa+UwP1fqO8QoRYP8DY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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