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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '968f7d13b39a7b4134dd94d14273f9144e5d599e4a143c69dce52c71601cecce' 
  AND token = 'U+9HfAPHtCWcXIIuaOdyIDWYARKA+Nix7rKMZNF27eo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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