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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8658f7714cdade209f8fe9d9c6509530cc8e75a915fc130d62d67e73a687b94c' 
  AND token = 'XtJ0kaIAMSaKqyZ6Foge0CaIUZBKLxdPpp9+sIMSN5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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