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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11c71bce30bf9b1c3a61f7f3e02f875cc1fbd1a5fda28f074778f168d7517933' 
  AND token = 'z9WWqAZs+JFvZHxP1yYdF8E+mIqpFij5l253BHTtjl4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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