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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '897a611bac022cc4966feedb63983d43de902d65fd14b7376dadca4607f7d0f5' 
  AND token = '0VutI7e8acTSFy2Z8T0vcghNfxqvcHUSncWYvKWaAfU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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