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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e96647a305c0cd66e135cb9c508ad5d8b4f0feb4ab2a3332b88070a255e94a5a' 
  AND token = 'Ivuh/nZbOdzZ/+/+M/uIVW0aIkss+dgrQqAzQkwyKbI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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