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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b3f4f0ea3039a8592e80d1080ee4d2b96657d7e00dfba863c1e192104bd0fd2' 
  AND token = 'nU18KfsQmd4h335vb+kkq0+JONiKqsF7UEyu6BjoQHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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