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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84001974efc3a68ae5259bf905a434863c4bccaad9389ad9c6c53f7333535c0c' 
  AND token = 'SEqSYSpfeTBdJ3mVv1+DXKlY2mFkVj+38kU/WnEq/7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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