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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68ae05b9125a695cc1cf344adc30daf222c3ddf1153397d1670c1c9b277c0e04' 
  AND token = 'nJfSLRi3TgpiSQ6vJE5XrYAyy1LZs06qCYCPMtEF6D8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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