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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '377c8ffd6ac013f84c5f6ea5381c9fd791fe627c6dfdd1564fed230de1effc5f' 
  AND token = 'y1AWik9/AI4SjOyueO5uqyZN3mk2679gJ0uXJDftQw0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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