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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24d54880de0b416483dda697edd82f4b4cdf88e289d40d70663db00a5931fe18' 
  AND token = 'kjCNf8P1etkePwKLaNvYyP2Z/j6dt2CG0fIA6V4rwR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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