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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0aceca4dbd851e5974262f451b953830f1ecdf909bbb041b9cca77a16c02659' 
  AND token = 'pz6pQnb5NCycu0uq5GhuQIJC3Y7NURRlP9qIGn+0Fg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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