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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91f792fea946796c4f5048cb4493eb80bb70a2be9b337e6ea9c18c496459634d' 
  AND token = 'yIV6uvP5TRek/6VGzgcQfHtogKN21BRyyX0N8i1qRMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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