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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aef2febea38ca6b5a23a48b3ead499cd7b69ccd42cd6761cc29a91c0bd45dcbf' 
  AND token = 'WfNxxHJco9vUeE5so+kI8wGypSh2UBT5FKUUXF14w/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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