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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bed50d055f2c0da018cd07be62b33568b21eb2a9f19e6e03357b1c425db350e7' 
  AND token = 'v6aa9toJP5N0QgKYpBu7LdfUaLlZF+6OPcQIYIg22tE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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