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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f59c47e65cca4c67f466900c56079ddd31f5815ef79de3e01c6acbb0cd798c36' 
  AND token = 'BNt/1FVVmOzNBCiz+/MZfKcnMkODUWqY8aUTjjoTW/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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