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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '124b48f193093ab75ec93f2a93be4751d6da9f8c60e8687d86cb3c0e803bca8a' 
  AND token = '8ykl7zbglXsOECbuaPsq+Hffni0VbvP0wyTi6lS8/Eg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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