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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd8c3ad3979d6ba17afad3a3bb9c83ebc1b3fa8b3c3c7142327e5381f9642ff3' 
  AND token = '+qp9cVF8FPa6kRS5oXoyKpd15bZK+A2ZFyZFonN7DRo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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