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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f9db9677780b3e9e8caa449e1edf827587671b94caf191520ff43e4162713f6' 
  AND token = '/pECIK3IrBCdmSySvW5x46WBgmqbhXdW2i3T9VEos4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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