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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bacc80328999ed3693a5c7fe22be5b19722d46d510236d7a5a6cf086efce0634' 
  AND token = 'ga7/ecDFN9inCoKtHSKnHOr/WkzHctpgFHQVxFbhQBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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