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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b23b9b92a9992df6b875b62caec767e4e758017b5bde1ccd960a4d17ebeb7a1' 
  AND token = 'fuJT0sqyj5zjkwOw4mUu5yxy7rxhq7MOu82qCEv9NYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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