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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '823b1a66621832ac3c4ad198db53bf821800f16e72f2bc7bf0c8a93e07db26d8' 
  AND token = 'RRekShvyVMqEpapD1FhYZi3diHlrU03XSVKUks2HzWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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