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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd759ed657f108252e1a651a5df3c0e9b4ddbfa61f398584781fc328cee3904ca' 
  AND token = 'bsfMranGy5F6YGcoMWlDmKgdEKMbanQG4gxp5VWHwTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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