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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fbf65b38b1d4e8c9d3b9cfc0a7d76b4c90d194f6066667998ce48d001450b0a' 
  AND token = 'UlcSgs4eFRVrOZ1FaZ3KSAaNZxywaiLs8/SW0NirATs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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