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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57efccae7b55e31c0885ad34178be4164bd248a40e02c30022e853c8c33774d4' 
  AND token = 'yBx7zWkMvC35xX38nWrPkmcANPT5JH3d2HYaayQzXqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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