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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8b0282eaab1792a6010fd4579daea2eeba35b8e164676ff02781d5293d09563' 
  AND token = 'U7/8NM9Z0CY5+ucUO3xFspJsZAG0ahSUi2M+s1nW020=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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