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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddb988966d015b4c3091d8d3ca6d69540ea354be659fa804d7054e5867117227' 
  AND token = 'Jw4AUX2O7hn47xDf5RC0qVGH/GdkRSsJBeEn9ML4EkY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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