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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '934bfe7e125a5f59290b50a6db963301d19b43fb3b48c706e2f114ef50534ed6' 
  AND token = '66m6OXs6SXfykQge0dYgdwmEViMP+tjjElOCd2kgLfw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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