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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2fc401ec0173da19cf8362b2eda073f9807a21f918999d735e7cc7ed766e7eb' 
  AND token = 'JO3/kx6fQBJfux6ZmdD+QoAGBSYbwWbdTzt8Yl7QB7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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