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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cb69309d19dd76ca5cdab815260f79fbba73b5c4991b9e5d7e0b334907e03c5' 
  AND token = 'UGb3zDE1lhxRu8nNVH6RGEGJjq/dX/8Z1PBVBCRANp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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