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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8045464d4ea6d6df4e02e594dcf7edaaf324e36fb6d08f443c46bcf62a193515' 
  AND token = '/65AKK/44rak5vmJEZ5Fla4otMR9PCZDIdOBIqVezdA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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