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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c182fdab0c7d4a4ff98caf42c669ff71364ca42d144af401c91710baf98ac96' 
  AND token = 'fYFH5V3m3ivHiqu+fZItWfqLsUBmcKWvz6j0/y6uULs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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