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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2176aa2d385d55190fe50ad294aef44fb8dc49c8969a60df5b59da6a0c14faa0' 
  AND token = '6Ak1CLA1bahfkFOxbKm1LRUEhcqgLn3jKjWx0wFGsgU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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