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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '855b2ef1e32414fcacf274a90e3a1945f6a6bcc769c06f097764841e51cd8b01' 
  AND token = 'rHuTBeN3n/LuOo4w0hGcFfohWRKr2TnfkK6FPNR0aZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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