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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd35b65e9f36b2205f451bd959af1c239e2808ceafbc7d91008c0d2b54e15db5d' 
  AND token = 'sIxDOrK9qOAiaaVzGOrm19hwnM4IyzG1uAAxd3FU268=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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