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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e592b7c7db9214d5712e36b61d6b792f731fe58fb066f2521d920cdc8d6410f7' 
  AND token = 'Z/30NNpx5rTxSKCxFARU2ufCD8GMuTq9HyC7v9e0kOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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