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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71614b8f3e3c8b6003ff3ca2f69dd9d9feac07f458a63faaa3ed432e8a0aa34a' 
  AND token = 'pqyHAgb7i0KmhQbfTSEzTm30aQo4MVBFirX9DTr6KHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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