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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c6e7a3c4633c3e478d300390c7636570811d9b231b099b87dc835eebd128fbe' 
  AND token = 'RM6f+Xt8fT8yBxFZzESnGRSCRMTx0U3gUTNdXq6L+Ec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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