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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e30919b416987b73636168340a8bdd937e02632887f9d4bfde33ceff6db18d3' 
  AND token = 'wEKCy1kDQipKA0ODKVQX+0WBoK0D4WAhUiCgh2RAcY4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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