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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9970cf1a7dcf2e8a9598ec251c6294740041ca96e6bb3c876f0f2d5739ae0a19' 
  AND token = '2KlO7YNlKO5kO7u2MR+G0I+MpE4Cfu2oCoTFnt8NMB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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