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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8184035c80bec3a7a0c5edb5d6e21930979574b08b33632b1729042ee93797f8' 
  AND token = '/vySjD+owqcmlzNIwg1oyO3wiI59t/JDE1A3YcOozHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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