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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bf01225eaad809a68e33d52fd6928697fd094fb69291b0ba3a550b9b3511a88' 
  AND token = '5zZHOz0Ga5FId+utpKiS89JfaYnFyjoxvtublQjaBco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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