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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd940518ad7353a781996c82ae65fdd62ba9dc6e17cbba24299199e22a626e54' 
  AND token = 'SJHZ9IrbU3QC9Jo/S2Y8kPiHgxa/JsdIIobRiM9oDCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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