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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30244777d52c991ead5e6483588938ac95a82c5a5171d96ec7aec511488fcb1a' 
  AND token = 'Jxppg50G6Dbnx8qKZwcdV7wburqCUWaNLCP0SUWwmqI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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