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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab2ea402fb7b85fb2929bd04939af4f25ca3a6194b720c39f4d2664e2b8b62e1' 
  AND token = 'Y3lZt7wrRFoqE4+q3E5DWtAf9X61qbHkL6f5m9NJSc0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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